N7 - Archaeological Dig Site part 1

This side quest can be taken-on at will, though you're going to need to know exactly where to look in order to find the side quest in question (that's where we come in, of course). For starters, use the nearest Mass Relay to jump from your current location toward the Rosetta Nebula. Upon a successful jump, you should find yourself in the Enoch system, which is precisely where you want to be. You're seeking out a small, rocky planet in this system known as Joab. Now, Joab has a really interesting history, and that history is at the center of this side quest. At one time, a space-faring species lived on this planet, but was devastated and obliterated from the face of the planet at some point in this history. Archaeological digs have discovered remnants of this long-lost civilization, and from the look of it, Blue Suns mercenaries have taken up refuge in one of these dig sites. It's up to you to be sure they vacate the premises, one way or another.

After scanning the planet, sending a probe down at the appropriate location, and landing at said location, you'll gain control of your party on the surface of this temperate planet. As you push forward towards the door into the archaeological dig site, you'll be intercepted by a crew of mercenaries, who will pour out of the door in several separate waves. Use the plentiful cover around you to protect yourself from enemy fire (staying away from the "fragile crates" if you can, since they are useless as sturdy cover), and return fire on your marks when it's safe to do so. Patiently erode the enemy numbers as they come through the door -- when you're certain you've seen the last of the enemy force for the time being, you can then press through that very same door to continue. Of course, before doing so, we implore you to explore the left side of this compound while still outside, since two small boxes of the ever-precious Element Zero can be found when you do.

When you head inside, move forward and seek cover immediately. There are a few Blue Suns mercenaries within this large room, and more of them will pour out of the two doors on your left. Yet another wave will then assault you from the glass-lined catwalks at the far end of the room as well. You'll need to deal with these enemies in rapid sequence to ensure that they don't overwhelm you with their numbers. You'll also need to cleverly use cover here, since it's entirely possible that you'll be attacked from three specific, separate angles. As always, the enemies closest in proximity to you should be felled first, since they will no doubt always pose the biggest threat. Otherwise, it's a mercenary-killing free for all, so get to it!